Method and apparatus for processing seismic data

Abstract

Methods and apparatuses for processing seismic data carrying information about a subsurface structure are provided. One method includes splitting the seismic data in groups, each group including subsets of seismic data for which a distance from a respective shot point to a receiver line in a patch of active detectors corresponding to the shot point is within a predetermined range for the group, and extracting signal data for each block Hankel matrix based on an SVD analysis thereof. Another method includes extracting signal data by subtracting from seismic data an estimated noise model obtained by rank reduction of a Hankel matrix followed by dip filtering, enhanced based on a least square matching filter with the seismic data.

Description

BACKGROUND[0001]1. Technical Field[0002]Embodiments of the subject matter disclosed herein generally relate to methods and apparatuses for processing seismic data, more particularly, to adaptive rank reduction methods for attenuating (subtracting) the noise in recorded seismic data.[0003]2. Discussion of the Background[0004]During the past years, the interest in developing new oil and gas production fields on land and offshore has continued to increase. Therefore, geophysical surveys have become more sophisticated in order to more accurately decide where to drill to avoid a dry well. The term “geophysical survey” refers to a systematic collection of geophysical data using various techniques. The data may be collected from above, on or below the Earth's surface and the sea surface. Seismic methods (such as reflection seismology and seismic tomography) are the most frequently used techniques in geophysical surveys due to their efficiency in terms of penetration depth, relatively reduc...

AI Technical Summary

Benefits of technology

[0020]According to another exemplary embodiment, there is a computer-readable storage medium non-transitorily storing executable codes which, when executed on a computer, make the computer perform a method for processing seismic data carrying information about subsurface. The method includes generating a block Hankel matrix using a Fourier transform of the seismic data, performing a Singular Value Decomposition (SVD) of the block Hankel matrix, estimating noise assumi...

Problems solved by technology

While this profile does not provide an accurate location for the oil and gas reservoirs, it suggests, to those trained in the field, the presence or absence of oil and/or gas reservoirs.

The seismic data may suffer from high levels of noise, making the task of processing and interpreting the data difficult.

Land seismic data is often overwhelmed by coherent noise, which, if not removed, renders the extracted information unreliable.

The spatial and temporal variations of phase velocity versus frequency...

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